function  data = sellProcedurePlot()
   data = textread('data.txt');
   dSize = size(data);
   itemId = [];
   trust = [];
   x = [];
   y = [];
   num = dSize(1)/4;
   len = dSize(2);
   hold on;
   for i = 1:num
       curr = data(4*i-3:4*i,:);
       for j = 1:len
           if curr(2,j) > 0
               x = [x,curr(2,j)];
               y = [y,curr(3,j)];
           end
       end
       %display(x);
       %display(y);
       plot(x,y);
       hold on;
       x = [];
       y = [];
   end
end